Camera optical lens

ABSTRACT

The present disclosure relates to the field of optical lenses and provides a camera optical lens. The camera optical lens satisfies following conditions: 62.00&lt;R7/f4&lt;70.00; 0.10&lt;R1/R2&lt;0.40; and −0.50&lt;R3/R4&lt;−0.30, where f4 denotes a focal length of the fourth lens; R1 denotes a curvature radius of an object side surface of the first lens; R2 denotes a curvature radius of an image side surface of the first lens; R3 denotes a curvature radius of an object side surface of the second lens; R4 denotes a curvature radius of an image side surface of the second lens; and R7 denotes a curvature radius of an object side surface of the fourth lens.

TECHNICAL FIELD

The present disclosure relates to the field of optical lens, and more particularly, to a camera optical lens suitable for handheld terminal devices such as smart phones or digital cameras and camera devices such as monitors or PC lenses.

BACKGROUND

With the emergence of smart phones in recent years, the demand for miniature camera lens is increasing day by day, but in general the photosensitive devices of camera lens are nothing more than Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor), and as the progress of the semiconductor manufacturing technology makes the pixel size of the photosensitive devices become smaller, plus the current development trend of electronic products towards better functions and thinner and smaller dimensions, miniature camera lenses with good imaging quality therefore have become a mainstream in the market.

In order to obtain better imaging quality, the lens that is traditionally equipped in mobile phone cameras adopts a three-piece lens structure. Also, with the development of technology and the increase of the diverse demands of users, and as the pixel area of photosensitive devices is becoming smaller and smaller and the requirement of the system on the imaging quality is improving constantly, a four-piece lens structure gradually appears in lens designs. Although the common four-piece lens has good optical performance, its settings on refractive power, lens spacing and lens shape still have some irrationality, which results in that the lens structure cannot achieve a high optical performance while satisfying design requirements for ultra-thin lenses having a big aperture.

BRIEF DESCRIPTION OF DRAWINGS

Many aspects of the exemplary embodiment can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.

FIG. 1 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 1 of the present disclosure;

FIG. 2 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 1;

FIG. 3 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 1;

FIG. 4 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 1;

FIG. 5 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 2 of the present disclosure;

FIG. 6 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 5;

FIG. 7 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 5;

FIG. 8 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 5;

FIG. 9 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 3 of the present disclosure;

FIG. 10 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 9;

FIG. 11 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 9; and

FIG. 12 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 9.

DESCRIPTION OF EMBODIMENTS

The present disclosure will hereinafter be described in detail with reference to several exemplary embodiments. To make the technical problems to be solved, technical solutions and beneficial effects of the present disclosure more apparent, the present disclosure is described in further detail together with the figure and the embodiments. It should be understood the specific embodiments described hereby is only to explain the disclosure, not intended to limit the disclosure.

Embodiment 1

Referring to FIG. 1, the present disclosure provides a camera optical lens 10. FIG. 1 shows the camera optical lens 10 according to Embodiment 1 of the present disclosure. The camera optical lens 10 includes 4 lenses. Specifically, the camera optical lens 10 includes, from an object side to an image side, an aperture S1, a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. An optical element such as a glass plate GF can be arranged between the fourth lens L4 and an image plane Si. The glass plate GF can be a glass cover plate or an optical filter. In other embodiments, the glass plate GF can be arranged at other positions.

In present embodiment, the first lens L1 has a positive refractive power, and has an object side surface being a convex surface and an image object surface being a concave surface; the second lens L2 has a negative refractive power, and has an object side surface being a concave surface and an image object surface being a concave surface; the third lens L3 has a positive refractive power, and has an object side surface being a concave surface and an image object surface being a convex surface; and the fourth lens L4 has a negative refractive power, and has an object side surface being a concave surface and an image object surface being a concave surface.

In addition, a surface of a lens can be set as an aspherical surface. The aspherical surface can be easily formed into a shape other than the spherical surface, so that more control variables can be obtained to reduce the aberration, thereby reducing the number of lenses and thus effectively reducing a total length of the camera optical lens according to the present disclosure. In an embodiment of the present disclosure, both an object side surface and an image side surface of each lens are aspherical surfaces.

Here, a focal length of the fourth lens L4 is defined as f4, a curvature radius of the object side surface of the first lens L1 is defined as R1, a curvature radius of the image side surface of the first lens L1 is defined as R2, a curvature radius of the object side surface of the second lens L2 is defined as R3, a curvature radius of the image side surface of the second lens L2 is defined as R4, and a curvature radius of the object side surface of the fourth lens L4 is defined as R7, where f4, R1, R2, R3, R4 and R7 satisfy following conditions: 62.00<R7/f4<70.00   (1); 0.10<R1/R2<0.40   (2); and −0.50<R3/R4<-0.30   (3).

The condition (1) specifies a shape of the fourth lens L4. This can effectively correct aberrations caused by the first three lens (the first lens L1, the second lens L2 and the third lens L3) of the camera optical lens.

The condition (2) specifies a shape of the first lens L1. This can alleviate a deflection degree of light passing through the lens, thereby effectively reducing aberrations.

The condition (3) specifies a shape of the second lens L1. This can facilitate eliminating aberrations and a lateral color.

In this embodiment, with the above configurations of the lenses including respective lenses (L1, L2, L3 and L4) having different refractive powers, each of the first lens L1, the second lens L2 and the fourth lens L4 has a specific shape, so that the camera optical lens can achieve a high optical performance while satisfying design requirements for ultra-thin lenses having a big aperture.

In an example, a curvature radius of the object side surface of the third lens L3 is defined as R5, and a curvature radius of the image side surface of the third lens L3 is defined as R6, where R5 and R6 satisfy a following condition of: 10.00<R5/R6<30.00   (4).

The condition (4) specifies a shape of the third lens L3. This can facilitate processing and assembly of the lenses.

In an example, a focal length of the third lens L3 is defined as f3, and an on-axis thickness of the third lens L3 is defined as d5, where f3 and d5 satisfy a condition of: 0.60<d5/f3<0.68   (5).

The condition (5) specifies a dimension and a refractive power of the third lens L3. This can facilitate processing and assembly of the lenses.

It should be noted that the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 that constitute the camera optical lens 10 of the present embodiment have the structure and parameter relationships as described above, and therefore, the camera optical lens 10 can reasonably distribute the refractive power, the surface shape, the material, the on-axis thickness and the like of each lens, and thus correct various aberrations. The camera optical lens 10 has Fno≤2.10. A total optical length from the object side surface of the first lens to an image plane of the camera optical lens along an optic axis (TTL) and an image height (IH) of the camera optical lens 10 satisfy a condition of TTL/IH≤1.50. This can achieve a high optical performance while satisfying design requirements for ultra-thin lenses having a big aperture.

FIG. 1 is a schematic diagram of a structure of the camera optical lens 10 in accordance with Embodiment 1 of the present disclosure. The design information of the camera optical lens 10 in Embodiment 1 of the present disclosure is shown in the following. Table 1 lists curvature radiuses of object side surfaces and images side surfaces of the first lens L1 to the fourth lens L4 constituting the camera optical lens 10, central thicknesses of the lenses, distances between the lenses, the refractive index nd and the abbe number vd according to Embodiment 1 of the present disclosure. Table 2 shows conic coefficients k and aspheric surface coefficients. It should be noted that each of the distance, radii and the central thickness is in a unit of millimeter (mm).

TABLE 1 R d nd vd S1 ∞ d0 = −0.187 R1 1.258 d1 = 0.562 nd1 1.5439 v1 55.95 R2 5.872 d2 = 0.293 R3 −5.728 d3 = 0.415 nd2 1.6614 v2 20.41 R4 17.358 d4 = 0.164 R5 −12.263 d5 = 0.895 nd3 1.5439 v3 55.95 R6 −0.700 d6 = 0.051 R7 −77.232 d7 = 0.389 nd4 1.5352 v4 56.12 R8 0.644 d8 = 0.100 R9 ∞ d9 = 0.210 ndg 1.5168 vg 64.17 R10 ∞ d10 =  0.352 In the table, meanings of various symbols will be described as follows. R: curvature radius of an optical surface, a central curvature radius for a lens; S1: aperture; R1: curvature radius of the object side surface of the first lens L1; R2: curvature radius of the image side surface of the first lens L1; R3: curvature radius of the object side surface of the second lens L2; R4: curvature radius of the image side surface of the second lens L2; RS: curvature radius of the object side surface of the third lens L3; R6: curvature radius of the image side surface of the third lens L3; R7: curvature radius of the object side surface of the fourth lens L4; R8: curvature radius of the image side surface of the fourth lens L4; R9: curvature radius of an object side surface of the glass plate GF; R10: curvature radius of an image side surface of the glass plate GF; d: on-axis thickness of a lens or an on-axis distance between lenses; d0: on-axis distance from the aperture S1 to the object side surface of the first lens L1; d1: on-axis thickness of the first lens L1; d2: on-axis distance from the image side surface of the first lens L1 to the object side surface of the second lens L2; d3: on-axis thickness of the second lens L2; d4: on-axis distance from the image side surface of the second lens L2 to the object side surface of the third lens L3; d5: on-axis thickness of the third lens L3; d6: on-axis distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4; d7: on-axis thickness of the fourth lens L4; d8: on-axis distance from the image side surface of the fourth lens L4 to the object side surface of the optical filter GF; d9: on-axis thickness of the glass plate GF; d10: on-axis distance from the image side surface of the glass plate GF to the image plane Si; nd: refractive index of d line; nd1: refractive index of d line of the first lens L1; nd2: refractive index of d line of the second lens L2; nd3: refractive index of d line of the third lens L3; nd4: refractive index of d line of the fourth lens L4; ndg: refractive index of d line of the glass plate GF; vd: abbe number; v1: abbe number of the first lens L1; v2: abbe number of the second lens L2; v3: abbe number of the third lens L3; v4: abbe number of the fourth lens L4; and vg: abbe number of the glass plate GF.

TABLE 2 Conic coefficient Aspherical surface coefficients k A4 A6 A8 R1 −4.1950E+00 1.80E−01 9.09E−01 −7.11E+00 R2 3.4760E+01 −3.94E−02 −4.67E−01 2.62E+00 R3 −4.3805E+02 −3.73E−01 1.97E−01 1.37E+00 R4 −4.1293E+02 4.87E−02 −5.26E−01 1.93E+00 R5 1.4231E+02 1.54E−01 −1.59E−01 −4.93E−01 R6 −5.6034E+00 −2.71E−01 7.90E−01 −1.61E+00 R7 4.9561E+02 −2.53E−01 3.97E−02 9.16E−02 R8 −6.1981E+00 −1.98E−01 1.47E−01 −8.58E−02 Aspherical surface coefficients A10 A12 A14 A16 R1 2.79E+01 −6.10E+01 6.98E+01 −3.27E+01 R2 −1.04E+01 2.16E+01 −2.38E+01 1.04E+01 R3 −1.20E+01 3.62E+01 −5.09E+01 2.74E+01 R4 −5.77E+00 1.10E+01 −1.12E+01 4.74E+00 R5 2.10E+00 −3.55E+00 2.81E+00 −8.90E−01 R6 2.21E+00 −1.65E+00 6.13E−01 −9.02E−02 R7 1.64E−02 −6.20E−02 2.64E−02 −3.53E−03 R8 3.46E−02 −9.19E−03 1.43E−03 −9.77E−05

In Table 2, k is a conic coefficient, and A4, A6, A8, A10, Al2, A14 and A16 are aspheric surface coefficients.

In the present embodiment, an aspheric surface of each lens surface uses the aspheric surfaces shown in the above condition (6). However, the present disclosure is not limited to the aspherical polynomials form shown in the condition (6). Y=(x ² /R)/{1+[1−(1+k)(x ² /R ²)]^(1/2) }+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰ +A12x ¹² +A14x ¹⁴ +A16x ¹⁶   (6)

Table 3 and Table 4 show design data of inflexion points and arrest points of respective lenses in the camera optical lens 10 according to Embodiment 1 of the present disclosure. P1R1 and P1R2 represent the object side surface and the image side surface of the first lens L1, respectively, P2R1 and P2R2 represent the object side surface and the image side surface of the second lens L2, respectively, P3R1 and P3R2 represent the object side surface and the image side surface of the third lens L3, respectively, and P4R1 and P4R2 represent the object side surface and the image side surface of the fourth lens L4, respectively. The data in the column named “inflexion point position” refers to vertical distances from inflexion points arranged on each lens surface to the optic axis of the camera optical lens 10. The data in the column named “arrest point position” refers to vertical distances from arrest points arranged on each lens surface to the optic axis of the camera optical lens 10.

TABLE 3 Number of Inflexion point Inflexion point inflexion points position 1 position 2 P1R1 1 0.745 P1R2 1 0.415 P2R1 1 0.785 P2R2 2 0.345 0.725 P3R1 2 0.245 0.505 P3R2 2 0.685 1.165 P4R1 2 0.915 1.445 P4R2 1 0.415

TABLE 4 Number of Arrest point Arrest point arrest points position 1 position 2 P1R1 0 P1R2 1 0.595 P2R1 0 P2R2 2 0.535 0.795 P3R1 0 P3R2 0 P4R1 P4R2 1 1.135

In addition, Table 13 below further lists various values of Embodiment 1 and values corresponding to parameters which are specified in the above conditions.

FIG. 2 and FIG. 3 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 486 nm, 588 nm and 656 nm after passing the camera optical lens 10 according to Embodiment 1. FIG. 4 illustrates a field curvature and a distortion of light with a wavelength of 588 nm after passing the camera optical lens 10 according to Embodiment 1, in which a field curvature S is a field curvature in a sagittal direction and T is a field curvature in a tangential direction.

In this embodiment, a full FOV of the camera optical lens is 2ω, and an F number is Fno, where 2ω=73.87° and Fno=2.05. Thus, the camera optical lens has a big aperture and is ultra-thin, while achieving a high imaging performance.

Embodiment 2

FIG. 5 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 2 of the present disclosure. Embodiment 2 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

Table 5 and Table 6 show design data of a camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 5 R d nd vd S1 ∞ d0 = −0.180 R1 1.262 d1 = 0.563 nd1 1.5439 v1 55.95 R2 6.454 d2 = 0.286 R3 −5.670 d3 = 0.422 nd2 1.6614 v2 20.41 R4 12.606 d4 = 0.170 R5 −17.670 d5 = 0.860 nd3 1.5439 v3 55.95 R6 −0.707 d6 = 0.052 R7 −82.568 d7 = 0.392 nd4 1.5352 v4 56.12 R8 0.649 d8 = 0.100 R9 ∞ d9 = 0.210 ndg 1.5168 vg 64.17 R10 ∞ d10 =  0.340

TABLE 6 Conic Aspherical surface coefficients coefficient k A4 A6 A8 R1 −4.3209E+00 1.79E−01 9.09E−01 −7.11E+00 R2 3.5218E+01 −3.81E−02 −4.66E−01 2.62E+00 R3 −3.8282E+02 −3.74E−01 1.97E−01 1.37E+00 R4 −4.8388E+02 5.09E−02 −5.23E−01 1.93E+00 R5 2.0287E+02 1.42E−01 −1.61E−01 −4.93E−01 R6 −5.6119E+00 −2.67E−01 7.90E−01 −1.61E+00 R7 −2.8117E+02 −2.53E−01 3.97E−02 9.14E−02 R8 −6.2377E+00 −1.99E−01 1.47E−01 −8.57E−02 Aspherical surface coefficients A10 Al2 A14 A16 R1 2.79E+01 −6.10E+01 6.98E+01 −3.27E+01 R2 −1.04E+01 2.16E+01 −2.38E+01 1.04E+01 R3 −1.20E+01 3.62E+01 −5.09E+01 2.74E+01 R4 −5.77E+00 1.10E+01 −1.12E+01 4.73E+00 R5 2.10E+00 −3.55E+00 2.80E+00 −8.91E−01 R6 2.21E+00 −1.65E+00 6.13E−01 −9.01E−02 R7 1.63E−02 −6.20E−02 2.64E−02 −3.53E−03 R8 3.46E−02 −9.20E−03 1.43E−03 −9.79E−05

Table 7 and Table 8 show design data of inflexion points and arrest points of respective lens in the camera optical lens 20 according to Embodiment 2 of the present disclosure.

TABLE 7 Number of Inflexion point Inflexion point inflexion points position 1 position 2 P1R1 1 0.745 P1R2 1 0.395 P2R1 1 0.785 P2R2 2 0.365 0.725 P3R1 2 0.205 0.525 P3R2 2 0.675 1.175 P4R1 2 0.915 1.425 P4R2 1 0.405

TABLE 8 Number of Arrest point Arrest point arrest points position 1 position 2 P1R1 0 P1R2 1 0.575 P2R1 0 P2R2 2 0.575 0.795 P3R1 2 0.395 0.605 P3R2 0 P4R1 P4R2 1 1.115

In addition, Table 13 below further lists various values of Embodiment 2 and values corresponding to parameters which are specified in the above conditions.

FIG. 6 and FIG. 7 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 486 nm, 588 nm and 656 nm after passing the camera optical lens 20 according to Embodiment 2. FIG. 8 illustrates a field curvature and a distortion of light with a wavelength of 588 nm after passing the camera optical lens 20 according to Embodiment 2, in which a field curvature S is a field curvature in a sagittal direction and T is a field curvature in a tangential direction.

In the camera optical lens 20 according to this embodiment, 2ω=74.60° and Fno=2.05. Thus, the camera optical lens 20 has a big aperture and is ultra-thin, while achieving a high imaging performance.

Embodiment 3

FIG. 9 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 3 of the present disclosure. Embodiment 3 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

Table 9 and Table 10 show design data of a camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 9 R d nd vd S1 ∞ d0 = −0.179 R1 1.265 d1 = 0.587 nd1 1.5439 v1 55.95 R2 4.671 d2 = 0.293 R3 −8.258 d3 = 0.362 nd2 1.6614 v2 20.41 R4 20.702 d4 = 0.186 R5 −8.337 d5 = 0.832 nd3 1.5439 v3 55.95 R6 −0.698 d6 = 0.052 R7 −75.514 d7 = 0.399 nd4 1.5352 v4 56.12 R8 0.656 d8 = 0.100 R9 ∞ d9 = 0.210 ndg 1.5168 vg 64.17 R10 ∞ d10 =  0.350

TABLE 10 Conic coefficient Aspherical surface coefficients k A4 A6 A8 R1 −3.7360E+00 1.74E−01 9.04E−01 −7.10E+00 R2 3.0535E+01 −6.36E−02 −4.57E−01 2.62E+00 R3 −5.0000E+02 −3.58E−01 1.78E−01 1.35E+00 R4 −5.0000E+02 3.69E−02 −5.32E−01 1.90E+00 R5 6.3310E+01 1.71E−01 −1.60E−01 −4.94E−01 R6 −5.2613E+00 −2.74E−01 7.90E−01 −1.61E+00 R7 5.0000E+02 −2.54E−01 3.93E−02 9.16E−02 R8 −6.2244E+00 −1.99E−01 1.48E−01 −8.57E−02 Aspherical surface coefficients A10 A12 A14 A16 R1 2.79E+01 −6.10E+01 6.98E+01 −3.26E+01 R2 −1.04E+01 2.16E+01 −2.39E+01 1.02E+01 R3 −1.20E+01 3.63E+01 −5.09E+01 2.74E+01 R4 −5.69E+00 1.10E+01 −1.13E+01 4.81E+00 R5 2.11E+00 −3.55E+00 2.79E+00 −8.78E−01 R6 2.21E+00 −1.65E+00 6.13E−01 −9.01E−02 R7 1.62E−02 −6.19E−02 2.64E−02 −3.54E−03 R8 3.46E−02 −9.19E−03 1.43E−03 −9.76E−05

Table 11 and Table 12 show design data of inflexion points and arrest points of respective lens in the camera optical lens 30 according to Embodiment 3 of the present disclosure.

TABLE 11 Number of Inflexion point Inflexion point inflexion points position 1 position 2 P1R1 1 0.755 P1R2 1 0.445 P2R1 1 0.785 P2R2 2 0.315 0.715 P3R1 2 0.305 0.505 P3R2 2 0.695 1.145 P4R1 2 0.915 1.465 P4R2 1 0.415

TABLE 12 Number of Arrest point Arrest point arrest points position 1 position 2 P1R1 0 P1R2 1 0.635 P2R1 0 P2R2 2 0.475 0.805 P3R1 0 P3R2 0 P4R1 2 1.425 1.495 P4R2 1 1.135

In addition, Table 13 below further lists various values of Embodiment 3 and values corresponding to parameters which are specified in the above conditions.

FIG. 10 and FIG. 11 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 486 nm, 588 nm and 656 nm after passing the camera optical lens 30 according to Embodiment 3. FIG. 12 illustrates field curvature and distortion of light with a wavelength of 588 nm after passing the camera optical lens 30 according to Embodiment 3, in which a field curvature S is a field curvature in a sagittal direction and T is a field curvature in a tangential direction.

In the camera optical lens 30 according to this embodiment, 2ω=74.82° and Fno=2.06. Thus, the camera optical lens 30 has a big aperture and is ultra-thin, while achieving a high imaging performance.

Table 13 below lists various values of Embodiments 1, 2 and 3 and values corresponding to parameters which are specified in the above conditions (1), (2), (3), (4) and (5) and values of relevant parameters.

TABLE 13 Embodiment 1 Embodiment 2 Embodiment 3 Notes R7/f4 65.12 68.98 62.56 Condition (1) R1/R2 0.21 0.20 0.27 Condition (2) R3/R4 −0.33 −0.45 −0.40 Condition (3) R5/R6 17.52 24.99 11.94 Condition (4) d5/f3 0.68 0.65 0.62 Condition (5) f 2.942 2.907 2.89 f1 2.808 2.762 2.989 f2 −6.392 −5.792 −8.78 f3 1.321 1.323 1.341 f4 −1.186 −1.197 −1.207 IH 2.285 2.285 2.285

It can be appreciated by one having ordinary skill in the art that the description above is only embodiments of the present disclosure. In practice, one having ordinary skill in the art can make various modifications to these embodiments in forms and details without departing from the spirit and scope of the present disclosure. 

What is claimed is:
 1. A camera optical lens, comprising, from an object side to an image side: an aperture; a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; and a fourth lens having a negative refractive power, wherein the camera optical lens satisfies following conditions: 62.00<R7/f4<70.00; 0.10<R1/R2<0.40; and −0.50<R3/R4<−0.30, where f4 denotes a focal length of the fourth lens; R1 denotes a curvature radius of an object side surface of the first lens; R2 denotes a curvature radius of an image side surface of the first lens; R3 denotes a curvature radius of an object side surface of the second lens; R4 denotes a curvature radius of an image side surface of the second lens; and R7 denotes a curvature radius of an object side surface of the fourth lens.
 2. The camera optical lens as described in claim 1, further satisfying a following condition: 10.00<R5/R6<30.00, where R5 denotes a curvature radius of an object side surface of the third lens; and R6 denotes a curvature radius of an image side surface of the third lens.
 3. The camera optical lens as described in claim 1, further satisfying a following condition: 0.60<d5/f3<0.68, where f3 denotes a focal length of the third lens; and d5 denotes an on-axis thickness of the third lens. 